how to change transparency of a color in c#

Question

I am using SSRS reportviewer to generate a report using objects. In my program, I am asking the user to input a string of commonly known colors such as \"Red\", \"<

Answer 1

I think what needs to be included among these answers is that the alpha value indicates how transparent the color is with 0 being the most transparent and with 255 being the most opaque. Here is a summary:

                     A L P H A    V A L U E
0 [<--- most transparent]  ... ... ... [most opaque --->] 255